Synthesis of colloidal MnAs_xSb_1−x nanoparticles: compositional inhomogeneity and magnetic consequences

Abstract

Colloidal synthesis of MnAsxSb1−x (x = 0.1–0.9) results in As-deficient crystalline cores with amorphous oxide shells. Magnetic studies reveal size and phase dependent magnetic properties, with a clear relationship between core size and coercivity.

Role of Noble- and Base-Metal Speciation and Surface Segregation in Ni2–xRhxP Nanocrystals on Electrocatalytic Water Splitting Reactions in Alkaline Media

“…We also considered the possibility that incorporation was limited for intermediate compositions, an effect we have previously observed in MnAs 1−x Sb x nanoparticles. 25 In the case of MnAs 1−x Sb x , we noted that As incorporation in MnSb was significantly limited, leading to observed compositions that were considerably As-poor relative to the targeted compositions. This was attributed to differences in relative reactivity.…”

“…It is possible that these subtle structural differences facilitate miscibility between Co 2 P and Rh 2 P but inhibit miscibility between Ni 2 P and Rh 2 P. Alternatively, there may be a competing ternary phase that is more stable, a possibility hinted at by the unidentified peak at near 37.5° 2θ (Figure ). We also considered the possibility that incorporation was limited for intermediate compositions, an effect we have previously observed in MnAs 1– x Sb x nanoparticles . In the case of MnAs 1– x Sb x , we noted that As incorporation in MnSb was significantly limited, leading to observed compositions that were considerably As-poor relative to the targeted compositions.…”